Door latch



Sept. 6, 1932. w. R. SCHLAGE DOOR LATCH Filed June 18, 1928 2 Sheets-Sheet l INVENTOR.

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. BY i 141/" 7 ATTORNEYS.

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Patented Sept. 6, 1932 UNITED STATES PATENT OFFIC WALTER. 1B. SCHLAGI, 0! ant I'BAROISGO, CALIFORNIA, ABBIGNOB 'IO BGHLLGE LOCI COMPANY, 01 SAN FRANCISCO, CALIFORNIA,

A OOBPOBATION 01' CALIFORNIA noon LATCH Applloatibn am June is,

1928, Serial Number 270,815 and especially to a dead locking attachment therefor.

The object of the present invention is to generally improve and simplify the construction and operation of door latches of the character described, and} especiallymto provide means for positivel dead loc g the latch bolt against forcib e retraction by a tool entered between the inclined face of the latch bolt and the striker plate.

The invention is shown by way of illustration in the accompanying drawings, in which: 7

Fig. 1 is a perspective view of the latch bolt actuating unit,

Fig. 2 is a perspective view of the latch bolt unit,

Fig. 3 is a-central vertical longitudinal section of the two units, said section also including a portion of-the door and jamb, and showing the position of the striker plate, b Fig. 4is a perspective view of the latch o t, Fi 5 is a perspective view of the latch boltlink,

Fig. 6 is a perspective view of the dead locking bolt, 1

Fig. 7 is a perspective view of the retractor crank,

Fig. 8 is a perspective viewof the anchor Fig. 9 is a section similar to Fig. 3, but showing the dead locking bolt extended,

bolt and the latch plate,

Fig. 11 is a central horizontal section of the latch bolt unit and the latch bolt actuating unit, showing the manner of'assembling the same in a door.

Referring-to the drawings in detail, and particularly to Figs.'1, 2, 3 and 11, Aindi- .cates in general the latch bolt actuating unit and B the latch bolt unit. These units areassembled in a door as shown in Fig. 11 by drilling or boringtwo holes therein, one hole, transversely through the door, as indicated at C, toreceive the latch bolt actuating unit,

, is a cam plate 5, which may be was. man Io. scam.

and the second hole such asindicated at D, which is drilled'through the edge of the door, to receive the latch bolt unit. The latch bolt actuating unit is best illustrated in Figs. 1 and 11. The latch bolt actuating unit may both. It is provided with a flat spindle bar 2, which in this instance is connected to a ke actuated unit as shown in Fig. 1 at one end, and by a knob L 3 at the opposite end, into which it extends. V

Thekey actuating unit consists of a linder 3, provided .with an'exterior escutc eon face plate 4. Mounted interior of the cylinder isthe-usual cylinder plug and tumblers, and secured to the outer end of the cylinder plug rotated when the key 6 is inserted, as shown in Fig.'11. The spindle bar 2 is connected with the cam Elate, so that it' will rotate in unison with the ey and the cylinder" plug. The manner of connecting the spindle bar 2 with the retractor, and the manner in which the retractor ac-' tuates the latch bolt will hereinafter be de-' with two posts or extension rods 7 and 8, the

outer ends of which are'drilled and tapped, as indicated at 9, to receive securing screws 10, these screws passin through an inner escutcheon plate 11, in w 'ch the inner knob 3a is journalled, the shank of this knob being rovided with a recess as 'reviolisly descri d, to receive the inner end of the spindle 2 so that the spindle may be rotated by the key The screws 10 secure, t e latch bolt actuating mechanism, to wit the cylinder 3 and the outer escutcheon plate 4, together with the inner escutcheon plate 11 and the knob 3a actuated mechanism or b the knob 3a. Fig. 10 is a perspective view of the latch against removal, and it also secures the latch bolt unit against removal, as will hereinafter inner end of the housin is closed by an end plate 16, and secured to t is end plate is an anchor plate 17, see Figs. 2, 3, 8 and 11. This anchor plate is substantlally centrally disposed with relation to the longitudinal axis of the housing B, and forms an extension thereof. It is provided with a notch 18, in its outer end and a perforation 19 in its inner end. The perforation 19 slips over the rod 8 when the two units are assembled in a door, while the notch 18 slides along the rod 7. An interlock is thus formed between the housing of the latch bolt unit and the latch bolt actuating unit, and this interlock also maintains a defi nite relation between the cooperating parts of the mechanism employed.

Slidably mounted in the outer end of the housing B and guided by the face plate '14 is the latch bolt proper. This is indicated at 20, and is best illustrated in Figs. 4 and 10. Secured'to the inner end of the latch bolt is a latch bolt plate and guide 21. The inner end ofthis plate extends through an opening 22 formed in the end plate 16. This opening serves as a guide for'the inner. endof the latch bolt and the plate. Pivotally secured to one side of the latch bolt, at the point 23,

is a latch link 24, which is best illustrated in l Figs. '3, 5, and 11. This link lies parallel with the latch bolt plate 21, as shown in Fig. 11 and the inner end thereof is offset, at the point 25 so as to overlay the anchor plate 17.

Formed in the upper fac'eof the anchor plate 17 is a'locking shoulder 17a and this "perforation almostfrectangular in sha shoulder is adapted to be'eng'a'ged by the inher end'24a ofthe -1atchlink124. A latch is formed in the inner endof the latch link, as indicated at 25a; A pin 26' extends through this opening and this pin is secured in the upper end of a retractor crank 27 this crank being best illustrated in Figs. 2,7 and 11.

r The crank consists of two parallel arms 27 as shown in Fig. 7, which are tied together at the lower end-by a cross web '28. The lower endsof the crank arms have aligned rectangular slots 29 formed therein andthese slots permit the spindle bar 2 to extend thereth'rough. That is, rotation of the spindle bar transmits a swinging movement to the crank arms 27 and the pin 26 carried by the upper end of the crank arms will thus engage the inner face of the enlarged opening 25 of the latch link, and thus pull the latch link together with the. latch bolt rearwardly thus retracting the same when the door is to be opened, either by key actuated mechanism shown in Figs. 1 and 11, or by inner knob 3a, shown in Fig. 11.

The latch link and the latch bolt connected thereto by means of the pivot 23, can, however, only be retracted when the link assumes the raised position shown in Fig. 9. That is, when the inner end of the link is raised with relation to the locking shoulder 17 a. On the other hand, when the link assumes its lowered position with relation to the shoulder 17 a, see

ig. 3, retraction of the link and the latch bolt will be prevented, as the inner end 24a of the link will engage theshoulder 17a,

thereby preventing retraction.

The latch link 24 is actuated not only by means of the retractor crank 27, shown in will hereinafter be described. iThe inner end of the bolt is drilled out, as shown at 33, to permit it to telescope and to be guided by I apin 34, securedtothe end plate 16 of the housing B. The upper face of the dead looking bolt is cut away, as at 35, to form a raised cam 36 at the inner end, and a shoulder 37 nearthe outer end. The position of the dead locking bolt is substantially on aline with the .longitudinal axis of the cylinder B at a point just below the latch link 24. The latch link is provided with an outwardly projecting lug 38, which restsin-the cut away. portion 35 of the dead locking bolt.

:When thedoor is opened and the latch bolt projected, as shown at: Figs. '9 and 11 the. "dead locking boltwill also projected, as

shown in these figures, being projected in] that case by a spring 40,- which surrounds the guide pin 34, the latch bolt a proper" being pro ected under such conditions by means of :a-spring 41, see:Fig.11'.- 1 I -When both helatch bolt and the dead locking bolt are projected, lug 38 on the latch ,link engages the cam 36 of the dead locking bolt, see Fig. 9. The inner end of the latch link is thus maintained in a raised position with relation to the pin 26 of the retractor crank and the locking'shoulde'r 17a. When so positioned, rotary movement may be imparted to the spindle bar 2 eitherby the key actuating mechanism or by the knob 3a. Such rotationcauses the retractoncranks 27 to swing rearwardly, pin 26 will during this "rearward movement engage the rear wall of the opening 25 formed in the inner end of the latch link, and the latch link, together with the latch bolt will accordingly be retracted as the inner point 24a of the latch link is then in a position to clear the locking shoulder 17a. 1

On the other hand, if the door is closed and the latch bolt is projected throughthe striker plate 50,- see Fig. 3, the dead locking bolt will engage the striker plate, and as such will be held in the retracted position shown in this figure. The lug 38 of the latch link will then ride in the cut awayportion 35 0f the dead locking bolt until it engages the i 2Q 24, such as here shown, a new structural comas shown in-Figs. 9

shoulder 3' 7. In other words, it rides ofi the This is important, as'the main latch bolt is latch bolt inwardly as t now-locked against retraction by unauthor ized rsons. For instance, if a jimmy or the e is inserted between the striker and the door against the inclined face of the main latch bolt, it will be impossible to force the e latch link 24 will engage the shoulder 17a, thereby preventing getractionof the latch bolt or j immying of the oor.

A dead lockmg' bolt or late, broadly speaking, is old, but as applibd in this instance, where it can ,cooperate with thelatch link bination is brought about.

By referrin to Figs. 3,9 and it will be noticed that the inner end of the latch bolt is provided with a wire spring 60. This spring is bent upwardly to engage the upper face of the lug 38 and as such serves the function of continuously exerting a downward pressure on the latch link, thereby maintainmg engagement either with the dead locking bolt cam 36 or with the cut away depressed portion formed thereon. The shoulder 32f0rmed on the inner face of the dead locking bolt engages the inner shoulder 20a of the latch bolt, and as such limits outward movement of the latch bolt dead locking bolt, outward movement of the main latch bolt 20 'being limited by engagement of the inner end of the latch pin 26. v

The dead locking bolt 30 has two main guides, first of all the guide pin 34. and secondlya guide lug 61, formed on the lower edge of-the latch plate 21, see Figs. 9 and 10.

Reference to my co-pending application, entitled Door latch filed April 18, 1928, Serial Number 270,815 referred to in this application, 'will show that the general construction of the latch actuating unit and the latch unit per se is substantlally identical to the mechanism illustrated in the present application, the only additional-features illustrated in the present application being the dead locking bolt, and the mechanism actuated thereb It is this mec anism, in combination with the mechanism illustrated in'my previous application which comprises the subject matter of the present application, and which is herein claimed'. a v

Briefly, the general operation of the mechanism here illustrated will be as-follows:

If a door containing a lock such as here shown is opened, both themain latch bolt and the deadlocking bolt will be projected,

and 11 'If the door is shoulder 32 two bolts will accordingly move inwardlyi hin.

link with the retractor crank closed, the inclinedface of the latch bolt will engage the striker plate 50 and as such will be gradually depressed. The dead locking bolt will at the same time bedepressed in unison with the latch bolt, as the inner shoulder 20a of the latch bo of the dead locking bolt. The

unison until completely depressed. moment, however, that the main latch bolt registers with the opening in the striker plate, it will be projected and the door will locked. No openin is formed in the striker plate for the dea locking bolt so this will remain depressed as shownin Fig. 3, while the main latch bolt will be proiected, as shown in the same figure. The depressed position assumed by the dead-locking bolt, in that instance, will cause the In 38 of the latch link to assume a depresse o'sition. The inner end 24a of the latch hnk will it will engage the inner thus lie behind the. locking shoulder '17 a and i jimmying of the latch bolt is accordinglv prevented. The latch bolt may', however, tracted byrotatin the'spindle bar 2, either by the knob or the key actuated mechanism as the inner end v24a of the latch links lie sufficiently far forwardly of the locking shoulder 17 a to permit the retractor pin 26 tolift the end 24a of the link clear of the shoulder, thus,'wln'le the latch bolt is locked against retraction by means of a jimmy, or the like, it is unlocked for legitimate opening, either by the knob, or by the key actuated mechamsm.

While certain features of the present in- .vention are more or less specifically described, I wish it understood that various changes may be resorted to within the scope of the appended claims, similarly that the materials and finishes of the several parts employed may be such as the manufacturer may declde, or varying conditions or uses may demand.

' Having thus described my invention, what I claim and desire to secure by Letters Patent 1s:

one end of the link and the main latch bolt, a stop member which the opposite end of 1. In a door'latch of the character dethe dogging link is adapted to engage, means whereby the dogging link is maintained out of. engagement with the stop member when.

the. auxiliary latch bolt is extended, and means whereby engagement is made with the stop member when the auxiliary latch'bolt is depressed. I 2.-In a doorv latch "of the character de- 4 scribed, an elongated tubular housing, a main pressed.

thereo 1 the retractor for releasing the doggin memlatch bolt and'an auxiliary latch bolt mounted in said housing and normally rejecting through one end thereof, said late es aligning andbeing operable on a common plane,

a pivotally mounted dogging member, a stop member cooperating therewith, means whereby' the doggin member is maintained out of engagement'wlth the stop member when the auxiliary latch bolt is extended, and means sion of the auxiliary latch bolt for moving the dogging member into dogging position to prevent depression of the main latch bolt when pressure is applied to the outer end a retractor, and means actuated by ber and for retracting the main latch "It 4. In a door latch'of the character deing, a main and an auxiliary latch bolt mounted in the housin and normally roectmg through the out end thereo a dogging link mounted in the housing, the forward end of the link being pivotally connected to the main ,latchbolt and ex nding through the rear end of the housing, asto member disposed behind the housing with which the rear endof the link is adapted to engage, a cam carried bythe auxiliarylatch bo t and engageab'le with the link to maintain the rear end of'the link'out of engagement wlth the stop member,'said cam bein operable only when the auxiliary latch lt is extended, a ?ring engaging the link and maintaining t e rear end thereof in engagement with the stop member when the auxiliary latch bolt is depressed, and other means for raising the rear end of the link out of engagement with the stop member, said means also adapted to exert a pull on the link to retract the main latch bolt.

7 WALTERR. SCHLAGE.

scribed, an elongated tubular housing, a main latch bolt and an auxiliary latch'bolt mount-. ed in said housing and normally projecting through one end thereof, said latches aligning and being operable on a commonplane, a pivotally mounted dogging member, astop member cooperating therewith, means whereby the doggingmember is maintained out of engagementwith the stop'member' when the auxiliary latch bolt is extended, means whereby engagement is made with the stop member when the auxiliary latch bolt is depressed a retractor positioned in the'same plane as t e latch bolt members, and means actuated by the retractor for releasing the dogging member andfor retracting the main latch bolt.

5. In a door latch of the character described an elongated tubular latch bolt housing, a main and an auxiliary latch bolt mount ed in the housing and normally projecting through the front end thereof, a dogginglink mounted in the housing, the forward end of the link being pivotally connected to the main latch bolt and extending through the rear end .of the housing, a stop member disposed behind the housing with which the rear end of the link is adapted to engage, a cam car-' ried by the auxiliarylatch bolt and engageable with the link to maintain the rear end of the link out of engagement with the stop member, said cam being operable only when the auxiliary latch bolt is extended, and a spring engaging the link and maintaining the rear end thereof in engagement with the stop member when the auxiliary latch bolt is depressed. I

6. In a door latch of the character described an elongated tubular latch bolt hous- 

